/**
 * @fileoverview Tests for template generation functions
 *
 * Tests the CLAUDE.md template generation including
 * default template and custom template loading.
 */

import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import { existsSync, writeFileSync, unlinkSync, mkdirSync, rmSync } from 'node:fs';
import { join } from 'node:path';
import { tmpdir } from 'node:os';
import { generateClaudeMd } from '../src/templates/claude-md.js';

describe('generateClaudeMd', () => {
  const testDir = join(tmpdir(), 'codeman-template-test-' + Date.now());

  beforeEach(() => {
    if (!existsSync(testDir)) {
      mkdirSync(testDir, { recursive: true });
    }
  });

  afterEach(() => {
    try {
      rmSync(testDir, { recursive: true, force: true });
    } catch (e) {
      // Ignore cleanup errors
    }
  });

  describe('default template', () => {
    it('should generate template with case name', () => {
      const result = generateClaudeMd('my-project');

      expect(result).toContain('**Project Name**: my-project');
    });

    it('should generate template with description', () => {
      const result = generateClaudeMd('my-project', 'A test project description');

      expect(result).toContain('**Description**: A test project description');
    });

    it('should use default description when not provided', () => {
      const result = generateClaudeMd('my-project');

      expect(result).toContain('**Description**: A new project');
    });

    it('should include current date', () => {
      const today = new Date().toISOString().split('T')[0];
      const result = generateClaudeMd('my-project');

      expect(result).toContain(`Generated by Codeman on ${today}`);
    });

    it('should include Codeman environment section', () => {
      const result = generateClaudeMd('my-project');

      expect(result).toContain('## Codeman Environment');
      expect(result).toContain('CODEMAN_MUX=1');
    });

    it('should include workflow rules', () => {
      const result = generateClaudeMd('my-project');

      expect(result).toContain('## Workflow');
      expect(result).toContain('conventional commits');
    });

    it('should stay under the 200-line CLAUDE.md guidance', () => {
      const result = generateClaudeMd('my-project');

      expect(result.split('\n').length).toBeLessThan(200);
    });

    it('should not include legacy bloat sections', () => {
      const result = generateClaudeMd('my-project');

      expect(result).not.toContain('## Session Log');
      expect(result).not.toContain('TodoWrite');
      expect(result).not.toContain('## Planning Mode');
      expect(result).not.toContain('[TECHNOLOGIES_USED]');
      // Ralph loop instructions live in the loop prompt (wizard) and plugin,
      // not in every project's CLAUDE.md
      expect(result).not.toContain('RALPH_STATUS');
      expect(result).not.toContain('/ralph-loop:');
    });
  });

  describe('custom template', () => {
    it('should use custom template when provided and exists', () => {
      const templatePath = join(testDir, 'custom-template.md');
      writeFileSync(
        templatePath,
        `
# [PROJECT_NAME]

Description: [PROJECT_DESCRIPTION]
Date: [DATE]

Custom content here.
      `
      );

      const result = generateClaudeMd('my-project', 'Test desc', templatePath);

      expect(result).toContain('# my-project');
      expect(result).toContain('Description: Test desc');
      expect(result).toContain('Custom content here.');
    });

    it('should replace all placeholder occurrences', () => {
      const templatePath = join(testDir, 'multi-placeholder.md');
      writeFileSync(
        templatePath,
        `
[PROJECT_NAME] is a project.
The name is [PROJECT_NAME].
About [PROJECT_NAME]: [PROJECT_DESCRIPTION]
      `
      );

      const result = generateClaudeMd('awesome-app', 'Cool stuff', templatePath);

      expect(result).toContain('awesome-app is a project.');
      expect(result).toContain('The name is awesome-app.');
      expect(result).toContain('About awesome-app: Cool stuff');
    });

    it('should use default description in template when not provided', () => {
      const templatePath = join(testDir, 'desc-template.md');
      writeFileSync(templatePath, 'Description: [PROJECT_DESCRIPTION]');

      const result = generateClaudeMd('my-project', '', templatePath);

      expect(result).toContain('Description: A new project');
    });

    it('should fall back to default template if custom file does not exist', () => {
      const result = generateClaudeMd('my-project', 'desc', '/nonexistent/template.md');

      // Should get default template content
      expect(result).toContain('## Codeman Environment');
      expect(result).toContain('**Project Name**: my-project');
    });

    it('should fall back to default template if custom path is empty', () => {
      const result = generateClaudeMd('my-project', 'desc', '');

      expect(result).toContain('## Codeman Environment');
    });

    it('should fall back to default template if custom path is undefined', () => {
      const result = generateClaudeMd('my-project', 'desc', undefined);

      expect(result).toContain('## Codeman Environment');
    });
  });
});